In a bid to rejuvenate traffic among its budget-conscious consumers, McDonald's is expanding its value menu offerings. Part of this comeback strategy includes creating a "more holistic U.S. value platform" starting as soon as next year.  There has been weakness in the lower-income consumer for the better part of the last 18 to 24 months, according to Sara Senatore, senior restaurant analyst at Bank of America. The issue is "lower income consumers do constitute a disproportionate amount of the customer base ...